diff --git a/master/master/config.h b/master/master/config.h
--- a/master/master/config.h
+++ b/master/master/config.h
@@ -21,6 +21,8 @@
 #define MODULE_ID '1'
 #define BOARDTEMP_ADDR 0x90
 
+#define HEATER_THRESHOLD 70
+
 // --------------------------------------------------------------------------
 // Error Codes config (led.c, used throughout code)
 // --------------------------------------------------------------------------
diff --git a/master/master/master.c b/master/master/master.c
--- a/master/master/master.c
+++ b/master/master/master.c
@@ -124,6 +124,7 @@ int main(void)
 		{
 			led_on(LED_CYCLE);
 			
+			heater_regulateTemp();
 			
 			// Print out GPS debug
 			//snprintf(debugBuf, 128, "GPS> time: %s lat: %s lon: %s speed: %s hdop: %s course: %s\r\n",
diff --git a/master/master/master.cproj b/master/master/master.cproj
--- a/master/master/master.cproj
+++ b/master/master/master.cproj
@@ -138,6 +138,12 @@
     <Compile Include="lib\boardtemp.h">
       <SubType>compile</SubType>
     </Compile>
+    <Compile Include="lib\heater.c">
+      <SubType>compile</SubType>
+    </Compile>
+    <Compile Include="lib\heater.h">
+      <SubType>compile</SubType>
+    </Compile>
     <Compile Include="lib\i2c.c">
       <SubType>compile</SubType>
     </Compile>